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This article describes a new block copolymer (EG m - b -AP n , where m and n denote the degrees of polymerization) of poly(ethylene glycol) (PEG) and poly(1,4-(1- H -1,2,3-triazolylene)methylene) prepared by copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) polymerization of 3-azido-1-propyne (AP) in the presence of PEG carrying a propargyl moiety. The EG m - b -AP n samples are well soluble in polar organic solvents. Unexpectedly, we observed that solutions of EG m - b -AP n in N , N -dimethylformamide emitted fluorescence. We systematically studied absorption and emission properties of the block copolymers. The experimental data have exhibited that AP n block is an intrinsic fluorophore. Interestingly, the emission of EG m - b -AP n can be easily tuned from ultraviolet to green fluorescence by changing the excitation wavelength. This enables fine-tuning of its optical property without the need of changing the chromophore. Moreover, the block copolymers show a fluorescence response to metal ions (e.g., Cu 2+ ). Our discoveries contribute to the fundamental understanding of the optical properties of dense triazole-based polymer and raise intriguing prospects for fabricating novel emissive triazole-based materials.

Emission Properties of Diblock Copolymers Composed of Poly(ethylene glycol) and Dense 1,2,3-Triazole Blocks